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<div class="titlepage"><div><div><h3 class="title">
<a name="spirit.what_s_new.spirit_2_5_1"></a><a class="link" href="spirit_2_5_1.html" title="Spirit V2.5.1">Spirit V2.5.1</a>
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<h5>
<a name="spirit.what_s_new.spirit_2_5_1.h0"></a>
        <span class="phrase"><a name="spirit.what_s_new.spirit_2_5_1.what_s_changed_from_v2_5__boost_v1_47_0__to_v2_5_1__boost_v1_48_0_"></a></span><a class="link" href="spirit_2_5_1.html#spirit.what_s_new.spirit_2_5_1.what_s_changed_from_v2_5__boost_v1_47_0__to_v2_5_1__boost_v1_48_0_">What's
        changed from V2.5 (Boost V1.47.0) to V2.5.1 (Boost V1.48.0)</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            The <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">istream_iterator</span></code> (see <a class="link" href="../support/multi_pass.html" title="The multi pass iterator"><code class="computeroutput"><span class="identifier">multi_pass</span></code></a>) now checks at construction
            time whether the underlying stream has reached eof (end of file).
          </li>
<li class="listitem">
            <span class="emphasis"><em>Spirit.Qi</em></span> now properly collapses attributes generated
            from optionals embedded inside another optional parser (i.e. <code class="computeroutput"><span class="special">-(</span><span class="char">'('</span> <span class="special">&gt;</span>
            <span class="special">-</span><span class="identifier">int_</span>
            <span class="special">&gt;&gt;</span> <span class="char">')'</span><span class="special">).</span> <span class="identifier">That</span> <span class="identifier">means</span> <span class="identifier">that</span>
            <span class="identifier">attributes</span> <span class="identifier">like</span>
            </code>boost::optional&lt;boost::optional&lt;int&gt; &gt;<code class="computeroutput"> <span class="identifier">will</span> <span class="identifier">be</span>
            <span class="identifier">collapsed</span> <span class="identifier">to</span>
            </code>boost::optional&lt;int&gt;`. Thanks to Peter Schueller for reporting
            that problem.
          </li>
<li class="listitem">
            Actions attached to binary parsers now properly propagate the parser's
            attribute. Thanks to Mathias Born for reporting this issue.
          </li>
</ul></div>
<h5>
<a name="spirit.what_s_new.spirit_2_5_1.h1"></a>
        <span class="phrase"><a name="spirit.what_s_new.spirit_2_5_1.bug_fixes_in_lex"></a></span><a class="link" href="spirit_2_5_1.html#spirit.what_s_new.spirit_2_5_1.bug_fixes_in_lex">Bug
        Fixes in Lex</a>
      </h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Fixed <a href="https://svn.boost.org/trac/boost/ticket/5701" target="_top">TRAC#5701</a>: lexertl token_value_type returns const unused for nonconst
            ref.
          </li>
<li class="listitem">
            Fixed a problem in the lexer (position_token) causing problems with enabled
            parser debugging (MSVC2010).
          </li>
</ul></div>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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